HCURR
retval = HCURR(h, ev);
for (retval = HCURR(h, ev); retval != -1; retval = HPREV(h, ev))
for (retval = HCURR(h, ev); retval != -1; retval = HPREV(h, ev))
for (retval = HCURR(h, ev); retval != -1; retval = HNEXT(h, ev))
for (retval = HCURR(h, ev); retval != -1; retval = HNEXT(h, ev))
for (retval = HCURR(h, ev); retval != -1; retval = HPREV(h, ev))